Arc-lamp clutch.



R. STANDERWICK.

ARC LAMP CLUTCH.

APPLICATION FILED 00123. m2.

1 1 7 1 ,27 1 Patented Feb. 8, 1916.

Witnesses f or:

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UNITED STATES PATENT OFFICE.

REGINALD G. STANDERWICK, OF LYNN, MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

ABC-LAMP CLUTCH.

Application filed October 23, 1912.

To all whom it may concern:

Be it known that I, REGINALD G. STANDER- WICK, a subject of the King of Great Britain, residing at Lynn, in the county of Essex, State of Massachusetts, have invented certain new and useful Improvements in Arc-Lamp Clutches, of which the following is a specification.

My invention has reference to improvements in arc lamps, and more particularly to the operating mechanism of arc lamps, and comprises a novel form of clutch which is simple and reliable in operation.

For a fuller understanding of my invention, reference is had to the accompanying drawings, in which Figure 1 is a skeleton view showing the operating mechanism of the lamp and showing the circuits diagrammatically; Fig. 2 is a side elevation of the pulley and clutch, showing the clutch in the released position;

and Fig. 3 is a vertical sectional view of the clutch and pulley.

In the drawings, the upper and lower electrodes are indicated by the reference numerals 1 and 2, respectively. The upper electrode is received within an electrodeholder 3, to which is attached the lower end of a chain 4. -The lower electrode 2 is received within a carbon-holder 5 carried by a carbon rod 6, to the upper end of which is attached a chain 7. A pulley 8 is journaled on an axis 10 which passes through a sleeve 9 secured in the hub of the pulley. The axis 10 is supported in a stationary frame 11, preferably, so that the same does not rotate. The sleeve 9 thereby rotates about the axis 10. The pulley S, which is of the differential type, is provided with two sheaves 12 and 13, over which pass and to which are secured the chains 7 and 4, respectively. The sheaf 13 also forms a laterally extending peripheral flange having an inner cylindrical surface. An arm 15 is pivoted on the axis 10, being secured to and preferably integral with a sleeve 15 The arm 15 A which rotates about the axis. extends outwardly past the pulley 8.

Specification of Letters Patent.

Patented Feb. 8, 1916.

Serial No. 727,359.

clutch 16 is pivoted on the arm 15 at a point not far removed from the axis 10. One arm of the clutch extends outwardly and is provided with a cam surface 18, which, when the arm 15 is lifted, is adapted to jam against the inner surface of the flange 14, thus causing the pulley to move with the arm. The clutch and the arm on which the same is pivoted thus constitute a toggle which is operated by the upward movement of the arm 15, this movement tending to straighten the toggle, as is apparent. The clutch is also preferably provided with a downwardly extending arm 20, which is adapted to engage a stop 17, so that a further downward movement of the arm 15 carries the pivot of the clutch away from the radius extending from the axis 10 to the point of engagement of the cam surface of the clutch with the flange 14. The clutch is thereby disengaged from the flange 14. The clutch is also provided with a finger 19, which limits the upward movement of the clutch about its own pivot by contact with the sleeve 15. An idler 22 is provided for the chain 7.

The operating mechanism of the lamp comprises a series magnet 23 and a shunt magnet 24 and cooperating armatures 25 and 26, respectively. These armatures are connected to the respective ends of a lever 27 through rods 25 and 26 The lever 27 is pivoted at 28 to the frame of the lamp. The rod 25 is connected by an upwardly extending arm 29 to the outer end of the clutch arm 15. The lever 27 carries abridging contact 30 cooperating with two stationary contacts 31 and 32 included in the cutout circuit of the lamp.

The leading-in wires for the lamp are represented by the numerals 33 and 34. A conductor 36 is joined to the leading-in wire 33 at the point 35, and, from a point 37 on this latter conductor, conductor 38 is connected to the upper electrode-holder. Conductor 36, continuing beyond point 37 terminates at contact 31. The leading-in wire 33 is connected to one terminal of the shunt magnet 24, the other terminal of which is connected by a conductor 39 to one terminal of the series magnet 23, the other terminal of which is connected to the leading-out wire at the point 41. The leadingout wire connects with the cutout contact 32, and a. resistance 12 is included in the cutout circuit of the lamp between points ll and 32. This lamp is particularly adapted for use with alternating current, but it can also be operated with direct current, and under the latter assumption, and for the sake of simplicity of description, I have in the foregoing spoken of the conductors 33 and as as leading-in and leading-out wires, respectively.

The operation of the lamp is as follows: The carbons and the parts connected thereto are so arranged that when relieved from the action of the clutch they are brought into engagement by gravity, and the upper electrode and the parts connected thereto are so arranged that they overbalance the lower electrode throughout the trim. When there is no current on the lamp, the two electromagnets are dee'nergized and the lever 27 assumes the position in which the contact 30 is in bridging engagement with contacts 31, 32. When current is turned on (and assuming for the sake of simplicity that it is a direct current), the circuits through the lamps may be traced as follows: from leading-in wire 33 to conductor 36, and by conductor 38 through the electrodes which are at this time in contact, and from the lower electrode-holder to conductor 39, to and through the series magnet, and out by the leading-out wire 34. Another branch may be traced from'the point 37, by the extension of conductor 36 to and through the cutout contacts, and by resistance 42 out at the leading-out wire 34-. The current in this second branch may be limited by the resistance 42, so that enough current passes through the series magnet to cause the same to lift its armature, whereby the cutout circuit is interrupted as shown in the drawing. The conductor 33 is connected to one terminal of the shunt magnet 24, and the conductor 39 is connected to the other terminal. The magnet 24 is thus connected across the arc in the usual way. Assuming now that the electrodes are in engagement and current is turned on the lamp, the series magnet 23 is energized and lifts the rod 29 and the outer end of the arm 15. The. finger 20 is thereby removed from the stop 17 and the pivotal point of the clutch 16 is made to approach the radius extending from the axis 10 to the cam surface, and the cam surface is thereby caused to engage the flange l-fl and to move the pulley in a direction to sep arate the electrodes and establish the are. As the arc lengthens, the electrodes approach each other through the usual differential action of the magnets and the outer end of the arm 15 and the clutch 16 descend until the finger 20 engages the stop 17, when the cam surface is disengaged from the flange 1A, in the manner heretofore described, and the electrodes permitted to approach each other.

A clutch constructed in accordance with my invention possesses the advantage that when the arm 15 is actuated, the clutch promptly and firmly grips the flange of the pulley and the greater the force exerted on the arm, the more tightly will the clutch grip the flange. This action of the clutch is not affected by the small amount of wear on the inner face of the flange of the pulley or on the cam face of the clutch, which ocours in practice. Furthermore, any such wear on either the flange or the clutch will not substantially affect the feeding and regulation of the electrodes.

While my invention is particularly well adapted to a lamp of the focusing type, and while I have illustrated the same in a lamp of this character, it will he understood that it is not necessarily so limited. Furthermore, while my invention may be advantageously used in a lamp of the flaming and luminous type, where the arc is long and liable to be unsteady, and while in practice I have usually embodied my invention in lamps of this character, it will be understood that it may equally well be used in other types of lamps, and in general it will be understood that my invention is susceptible of various modifications which come within the spirit thereof.

What I claim as new, and desire to secure by Letters Patent of the United States, is

1. In combination with a pulley formed with a laterally extending peripheral flange, an arm pivoted on the axis of the pulley, a clutch pivoted on the arm having a part extending toward the flange, said clutch be ing weighted to turn on its pivot in a direction opposite to the direction of the clutch engaging movement of the arm, means for actuating said arm and therebyoperating the clutch, and means for releasing said clutch when the arm is released.

2. In combination with a pulley formed with a laterally extending peripheral flange, an arm pivoted on the axis of the pulley, a clutch pivoted on the arm between the axis and the flange of the pulley and having a part extending toward the latter, said clutch being weighted to turn on its pivot'in a di rection opposite to the direction of the clutch engaging movement of the arm, means for actuating said arm and thereby operating the clutch, and means for releasing said clutch when the arm is released.

3. In combination with a pulley formed with alaterally extending peripheral flange, operating the clutch, and a stop for engagan arm pivoted on the axis of the pulley, ing the clutch when the arm is released. 10 a clutch pivoted on the arm and having a In Witness whereof, I have hereunto set part extending toward the flange, said my hand this 21st day of October, 1912.

clutch being Weighted to turn on its pivot- REGINALD G. STANDERWICK. in a direction opposite to the direction of Witnesses: the clutch engaging movement of the arm, JOHN A. MCMANUS, Jr., means for actuating said arm and thereby FRANK G. HATTIE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G. 

